Classification of Kiwi Fruits According to Their Geographical Origin Based on Polyphenolic Compound Profile
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Abstract:
For the purpose of evaluating the possibility of identifying the geographical origin of kiwi fruits based on their polyphenolic profiles, the polyphenolic compounds of kiwi fruit samples from the Xixia of He’nan, the Meixian of Shaanxi, the Dujiangyan of Sichuan, and the Jianshi of Hubei province were determined by HPLC. The data were analyzed with a one-way analysis of variance (ANOVA), a principle component analysis (PCA), a K-nearest neighbors (KNN), and a stepwise linear discriminant analysis (SLDA). Subsequently, satisfactory classification models were proposed. The kiwi fruit samples could not be clearly classified by the one-way ANOVA and PCA analyses. The highest cross-validation rate of 96.0% was obtained when 3 was chosen as the K value. Nine polyphenolic compounds were introduced to the SLDA model, which had an overall correct classification rate and cross-validation (leave-one-out method) rate of 100%. These results demonstrate that the polyphenolic compound profiles could be successfully employed to classify the geographical origins of kiwi fruit if they are combined with the appropriate chemometric methods.
